TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
AU  - Radović, Nenad
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Bajić, Darko
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6008
AB  - This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 welded joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analyzing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding (FSW). Three-dimensional finite element (FE) model has been created in ABAQUS/Explicit software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.
PB  - VINČA Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure
EP  - 320
IS  - 1A
SP  - 311
VL  - 27
DO  - 10.2298/TSCI210216186V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Sedmak, Aleksandar and Radović, Nenad and Međo, Bojan and Mrdak, Mihailo and Bajić, Darko",
year = "2023",
abstract = "This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 welded joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analyzing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding (FSW). Three-dimensional finite element (FE) model has been created in ABAQUS/Explicit software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.",
publisher = "VINČA Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure",
pages = "320-311",
number = "1A",
volume = "27",
doi = "10.2298/TSCI210216186V"
}

Veljić, D., Rakin, M., Sedmak, A., Radović, N., Međo, B., Mrdak, M.,& Bajić, D.. (2023). Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure. in Thermal Science
VINČA Institute of Nuclear Sciences., 27(1A), 311-320.
https://doi.org/10.2298/TSCI210216186V

Veljić D, Rakin M, Sedmak A, Radović N, Međo B, Mrdak M, Bajić D. Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure. in Thermal Science. 2023;27(1A):311-320.
doi:10.2298/TSCI210216186V .

Veljić, Darko, Rakin, Marko, Sedmak, Aleksandar, Radović, Nenad, Međo, Bojan, Mrdak, Mihailo, Bajić, Darko, "Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure" in Thermal Science, 27, no. 1A (2023):311-320,
https://doi.org/10.2298/TSCI210216186V . .

TY  - JOUR
AU  - Jovanović, Gvozden
AU  - Glišić, Dragomir
AU  - Dikić, Stefan
AU  - Međo, Bojan
AU  - Marković, Branislav
AU  - Vuković, Nikola
AU  - Radović, Nenad
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6938
AB  - Two medium-carbon microalloyed steels with a predominant acicular ferrite microstructure were investigated in this study in order to determine the initial micro-crack formation mechanism and the role of acicular ferrite structure in cleavage fracture. In order to ensure cleavage fracture, samples were investigated at −196 °C for uniaxial tension and four point bending fracture. Previous investigations have shown that cleavage fracture for steels with a predominant acicular ferrite microstructure has not been initiated by the fracture of coarse TiN particles as in ferrite-pearlite, bainite, or martensitic microalloyed steels. The average maximal thickness of cementite plates measured in this work is 0.798 µm and 0.966 µm, for V and TiV steel, respectively. The corresponding stress values required for their fracture according to Griffith’s equation are 1970 MPa and 1791 MPa, respectively. Estimated values of the effective surface energy for the V steel with an average cementite volume fraction of 3.8% range from 40 Jm−2 to 86 Jm−2, and for the TiV steel with an average cementite volume fraction of 18.3% range from 55 Jm−2 to 82 Jm−2. The fracture of coarse cementite plates was found to not to be responsible for the cleavage fracture initiation in case of both steels.
PB  - MDPI
T2  - Materials
T1  - Determining the Role of Acicular Ferrite Carbides in Cleavage Fracture Crack Initiation for Two Medium Carbon Microalloyed Steels
IS  - 22
SP  - 7192
VL  - 16
DO  - 10.3390/ma16227192
ER  - 

@article{
author = "Jovanović, Gvozden and Glišić, Dragomir and Dikić, Stefan and Međo, Bojan and Marković, Branislav and Vuković, Nikola and Radović, Nenad",
year = "2023",
abstract = "Two medium-carbon microalloyed steels with a predominant acicular ferrite microstructure were investigated in this study in order to determine the initial micro-crack formation mechanism and the role of acicular ferrite structure in cleavage fracture. In order to ensure cleavage fracture, samples were investigated at −196 °C for uniaxial tension and four point bending fracture. Previous investigations have shown that cleavage fracture for steels with a predominant acicular ferrite microstructure has not been initiated by the fracture of coarse TiN particles as in ferrite-pearlite, bainite, or martensitic microalloyed steels. The average maximal thickness of cementite plates measured in this work is 0.798 µm and 0.966 µm, for V and TiV steel, respectively. The corresponding stress values required for their fracture according to Griffith’s equation are 1970 MPa and 1791 MPa, respectively. Estimated values of the effective surface energy for the V steel with an average cementite volume fraction of 3.8% range from 40 Jm−2 to 86 Jm−2, and for the TiV steel with an average cementite volume fraction of 18.3% range from 55 Jm−2 to 82 Jm−2. The fracture of coarse cementite plates was found to not to be responsible for the cleavage fracture initiation in case of both steels.",
publisher = "MDPI",
journal = "Materials",
title = "Determining the Role of Acicular Ferrite Carbides in Cleavage Fracture Crack Initiation for Two Medium Carbon Microalloyed Steels",
number = "22",
pages = "7192",
volume = "16",
doi = "10.3390/ma16227192"
}

Jovanović, G., Glišić, D., Dikić, S., Međo, B., Marković, B., Vuković, N.,& Radović, N.. (2023). Determining the Role of Acicular Ferrite Carbides in Cleavage Fracture Crack Initiation for Two Medium Carbon Microalloyed Steels. in Materials
MDPI., 16(22), 7192.
https://doi.org/10.3390/ma16227192

Jovanović G, Glišić D, Dikić S, Međo B, Marković B, Vuković N, Radović N. Determining the Role of Acicular Ferrite Carbides in Cleavage Fracture Crack Initiation for Two Medium Carbon Microalloyed Steels. in Materials. 2023;16(22):7192.
doi:10.3390/ma16227192 .

Jovanović, Gvozden, Glišić, Dragomir, Dikić, Stefan, Međo, Bojan, Marković, Branislav, Vuković, Nikola, Radović, Nenad, "Determining the Role of Acicular Ferrite Carbides in Cleavage Fracture Crack Initiation for Two Medium Carbon Microalloyed Steels" in Materials, 16, no. 22 (2023):7192,
https://doi.org/10.3390/ma16227192 . .

TY  - JOUR
AU  - Baljozović, Andreja
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Radovanović, Željko
AU  - Baščarević, Zoran
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6592
AB  - The cementless Corail stem is one of the most frequently implanted stems and has undergone several design changes. Currently in use is the third generation, named Corail AMT. Until now, only one third-generation Corail stem neck fracture has been described in 2020. In our paper, we present an almost identical complication with an additional analysis of the fracture using a scanning electron microscope. The revision surgery consisted of changing the broken implant with a Corail revision stem, along with replacing the polyethylene liner and the femoral head with new one, after which the patient achieved a full recovery. According to the available literature, this is the second case of this extremely rare complication.
PB  - Elsevier Inc.
T2  - Arthroplasty Today
T1  - An Extremely Rare Case of Cementless Third Generation Corail Stem Neck Fracture With Fractographic Analysis
SP  - 101176
VL  - 22
DO  - 10.1016/j.artd.2023.101176
ER  - 

@article{
author = "Baljozović, Andreja and Glišić, Dragomir and Radović, Nenad and Radovanović, Željko and Baščarević, Zoran",
year = "2023",
abstract = "The cementless Corail stem is one of the most frequently implanted stems and has undergone several design changes. Currently in use is the third generation, named Corail AMT. Until now, only one third-generation Corail stem neck fracture has been described in 2020. In our paper, we present an almost identical complication with an additional analysis of the fracture using a scanning electron microscope. The revision surgery consisted of changing the broken implant with a Corail revision stem, along with replacing the polyethylene liner and the femoral head with new one, after which the patient achieved a full recovery. According to the available literature, this is the second case of this extremely rare complication.",
publisher = "Elsevier Inc.",
journal = "Arthroplasty Today",
title = "An Extremely Rare Case of Cementless Third Generation Corail Stem Neck Fracture With Fractographic Analysis",
pages = "101176",
volume = "22",
doi = "10.1016/j.artd.2023.101176"
}

Baljozović, A., Glišić, D., Radović, N., Radovanović, Ž.,& Baščarević, Z.. (2023). An Extremely Rare Case of Cementless Third Generation Corail Stem Neck Fracture With Fractographic Analysis. in Arthroplasty Today
Elsevier Inc.., 22, 101176.
https://doi.org/10.1016/j.artd.2023.101176

Baljozović A, Glišić D, Radović N, Radovanović Ž, Baščarević Z. An Extremely Rare Case of Cementless Third Generation Corail Stem Neck Fracture With Fractographic Analysis. in Arthroplasty Today. 2023;22:101176.
doi:10.1016/j.artd.2023.101176 .

Baljozović, Andreja, Glišić, Dragomir, Radović, Nenad, Radovanović, Željko, Baščarević, Zoran, "An Extremely Rare Case of Cementless Third Generation Corail Stem Neck Fracture With Fractographic Analysis" in Arthroplasty Today, 22 (2023):101176,
https://doi.org/10.1016/j.artd.2023.101176 . .

TY  - JOUR
AU  - Veljić, Darko M.
AU  - Rakin, Marko P.
AU  - Sedmak, Aleksandar S.
AU  - Radović, Nenad A.
AU  - Međo, Bojan I.
AU  - Mrdak, Mihailo R.
AU  - Bajić, Darko R.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5152
AB  - The influence of friction stir welding parameters on thermo-mechanical behavior of the material during welding is analyzed. An aluminum alloy is considered (Al 2024 T351), and different rotating and welding speeds are applied. The finite element model consists of the working plate (Al alloy), backing plate and welding tool. The influence of the welding conditions on material behavior is taken into account the application of the Johnson-Cook material model. The rotation speed of the tool affects the results. If increased, it contributes to an increase of friction-generated heat intensity. The other component of the generated heat, which stems from the plastic deformation of the material, is negligibly changed. When the welding speed, i.e. tool translation speed, is increased, the intensity of friction-generated heat decreases, while the heat generation due to plastic deforming is becoming more pronounced. Summed, this leads to rather small change of the total generation. The changes of the heat generation influence both the temperature field and reaction force. Also, the inadequate selection of welding parameters resulted in occurrence of the defects (pores) in the model.
PB  - VINČA Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters
EP  - 2134
IS  - 3A
SP  - 2125
VL  - 26
DO  - 10.2298/TSCI210216186V
ER  - 

@article{
author = "Veljić, Darko M. and Rakin, Marko P. and Sedmak, Aleksandar S. and Radović, Nenad A. and Međo, Bojan I. and Mrdak, Mihailo R. and Bajić, Darko R.",
year = "2022",
abstract = "The influence of friction stir welding parameters on thermo-mechanical behavior of the material during welding is analyzed. An aluminum alloy is considered (Al 2024 T351), and different rotating and welding speeds are applied. The finite element model consists of the working plate (Al alloy), backing plate and welding tool. The influence of the welding conditions on material behavior is taken into account the application of the Johnson-Cook material model. The rotation speed of the tool affects the results. If increased, it contributes to an increase of friction-generated heat intensity. The other component of the generated heat, which stems from the plastic deformation of the material, is negligibly changed. When the welding speed, i.e. tool translation speed, is increased, the intensity of friction-generated heat decreases, while the heat generation due to plastic deforming is becoming more pronounced. Summed, this leads to rather small change of the total generation. The changes of the heat generation influence both the temperature field and reaction force. Also, the inadequate selection of welding parameters resulted in occurrence of the defects (pores) in the model.",
publisher = "VINČA Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters",
pages = "2134-2125",
number = "3A",
volume = "26",
doi = "10.2298/TSCI210216186V"
}

Veljić, D. M., Rakin, M. P., Sedmak, A. S., Radović, N. A., Međo, B. I., Mrdak, M. R.,& Bajić, D. R.. (2022). Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters. in Thermal Science
VINČA Institute of Nuclear Sciences., 26(3A), 2125-2134.
https://doi.org/10.2298/TSCI210216186V

Veljić DM, Rakin MP, Sedmak AS, Radović NA, Međo BI, Mrdak MR, Bajić DR. Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters. in Thermal Science. 2022;26(3A):2125-2134.
doi:10.2298/TSCI210216186V .

Veljić, Darko M., Rakin, Marko P., Sedmak, Aleksandar S., Radović, Nenad A., Međo, Bojan I., Mrdak, Mihailo R., Bajić, Darko R., "Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters" in Thermal Science, 26, no. 3A (2022):2125-2134,
https://doi.org/10.2298/TSCI210216186V . .

TY  - JOUR
AU  - Dikić, Stefan
AU  - Glišić, Dragomir
AU  - Fadel, Abdunaser Hamza
AU  - Jovanović, Gvozden
AU  - Radović, Nenad
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5285
AB  - The aim of this work was to establish a temperature of finish rolling stage of Nb/Ti microalloyed steel containing 0.06 wt.% C, 0.77 wt.% Mn, 0.039 wt.% Nb and 0.015 wt.% Ti, using physical simulation. Samples were subjected to laboratory simulation at a twist plastometer at high temperatures, i.e. between 825 and 950 °C. Five pass deformation and interpass times were selected in accordance with a processing parameters at five stand finishing hot strip mill. Restoration (recovery and/or recrystallization) behavior was evaluated by calculation of Fraction Softening (FS) and Area Softening Parameter (ASP) values. At 950 °C all individual pass stress-strain curves, FS and ASP show full recrystallization in all interpass intervals. On the other hand, with a decrease in temperature to the interval of 875-825 °C, the extent of restoration is decreasing, leading to recovery as a sole softening mechanism at 825 °C, which was confirmed by the stress-strain curve shape, and values of FS and ASP. It is assumed that, due to high supersaturation, strain-induced precipitation promoted pinning of grain and subgrain boundaries and suppressed recrystallization. Therefore, the critical temperature for finish rolling was estimated to be 825 °C.
AB  - Cilj ovog rada je određivanje temperature završnog valjanja Nb/Ti mikrolegiranog čelika koji sadrži
0,06 % C, 0,77 % Mn, 0,039 % Nb i 0,015 % Ti. Uzorci su ispitivani laboratorijskom simulacijom, na plastomeru - uredjaju za ispitivanje uvijanjem, na temperaturama, između 825 i 950 °C. Režim deformacije u
pet provlaka i pauza između provlaka odabrani su u saglasnosti sa parametraima valjanja na petostanskoj završnoj valjačkoj pruzi valjaonice toplovaljanih traka. Udeo obnovljene mikrostrukture (oporavljanja i/ili rekristalizacije) je određivan na osnovu proračuna prekidnog omekšavanja (engl. fraction
softening, FS) i parametra omekšavanja na osnovu promene površine ispod krive (engl. area softening
parameter, ASP). Na 950 °C krive deformacionog ojačavanja za svaki provlak, FS i ASP pokazuju
ponašanje koje odgovara potpuno rekristalisanom uzorku. Udeo obnovljene mikrostrukture se smanjuje
sa sniženjem temperature do intervala 875-850°C. Pretpostavlja se da zbog velikog presićenja dolazi do
pojave taloženja izazvanog deformacijom, što utiče na smanjenje pokretljivosti granica zrna/subzrna što
dovodi do potiskivanja rekristalizacije. Na 825°C obnavljanje se odvija isključivo mehanizmom oporavljanja pa se ova temperatura može uzeti za kritičnu temperaturu završnog valjanja.
PB  - Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Physical simulation of finish rolling of microalloyed steels in isothermal conditions
T1  - Simulacija završnog valjanja mikrolegiranog čelika u izotermalnim uslovima
EP  - 236
IS  - 4
SP  - 227
VL  - 76
DO  - 10.2298/HEMIND220816018D
ER  - 

@article{
author = "Dikić, Stefan and Glišić, Dragomir and Fadel, Abdunaser Hamza and Jovanović, Gvozden and Radović, Nenad",
year = "2022",
abstract = "The aim of this work was to establish a temperature of finish rolling stage of Nb/Ti microalloyed steel containing 0.06 wt.% C, 0.77 wt.% Mn, 0.039 wt.% Nb and 0.015 wt.% Ti, using physical simulation. Samples were subjected to laboratory simulation at a twist plastometer at high temperatures, i.e. between 825 and 950 °C. Five pass deformation and interpass times were selected in accordance with a processing parameters at five stand finishing hot strip mill. Restoration (recovery and/or recrystallization) behavior was evaluated by calculation of Fraction Softening (FS) and Area Softening Parameter (ASP) values. At 950 °C all individual pass stress-strain curves, FS and ASP show full recrystallization in all interpass intervals. On the other hand, with a decrease in temperature to the interval of 875-825 °C, the extent of restoration is decreasing, leading to recovery as a sole softening mechanism at 825 °C, which was confirmed by the stress-strain curve shape, and values of FS and ASP. It is assumed that, due to high supersaturation, strain-induced precipitation promoted pinning of grain and subgrain boundaries and suppressed recrystallization. Therefore, the critical temperature for finish rolling was estimated to be 825 °C., Cilj ovog rada je određivanje temperature završnog valjanja Nb/Ti mikrolegiranog čelika koji sadrži
0,06 % C, 0,77 % Mn, 0,039 % Nb i 0,015 % Ti. Uzorci su ispitivani laboratorijskom simulacijom, na plastomeru - uredjaju za ispitivanje uvijanjem, na temperaturama, između 825 i 950 °C. Režim deformacije u
pet provlaka i pauza između provlaka odabrani su u saglasnosti sa parametraima valjanja na petostanskoj završnoj valjačkoj pruzi valjaonice toplovaljanih traka. Udeo obnovljene mikrostrukture (oporavljanja i/ili rekristalizacije) je određivan na osnovu proračuna prekidnog omekšavanja (engl. fraction
softening, FS) i parametra omekšavanja na osnovu promene površine ispod krive (engl. area softening
parameter, ASP). Na 950 °C krive deformacionog ojačavanja za svaki provlak, FS i ASP pokazuju
ponašanje koje odgovara potpuno rekristalisanom uzorku. Udeo obnovljene mikrostrukture se smanjuje
sa sniženjem temperature do intervala 875-850°C. Pretpostavlja se da zbog velikog presićenja dolazi do
pojave taloženja izazvanog deformacijom, što utiče na smanjenje pokretljivosti granica zrna/subzrna što
dovodi do potiskivanja rekristalizacije. Na 825°C obnavljanje se odvija isključivo mehanizmom oporavljanja pa se ova temperatura može uzeti za kritičnu temperaturu završnog valjanja.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Physical simulation of finish rolling of microalloyed steels in isothermal conditions, Simulacija završnog valjanja mikrolegiranog čelika u izotermalnim uslovima",
pages = "236-227",
number = "4",
volume = "76",
doi = "10.2298/HEMIND220816018D"
}

Dikić, S., Glišić, D., Fadel, A. H., Jovanović, G.,& Radović, N.. (2022). Physical simulation of finish rolling of microalloyed steels in isothermal conditions. in Hemijska industrija
Association of the Chemical Engineers of Serbia., 76(4), 227-236.
https://doi.org/10.2298/HEMIND220816018D

Dikić S, Glišić D, Fadel AH, Jovanović G, Radović N. Physical simulation of finish rolling of microalloyed steels in isothermal conditions. in Hemijska industrija. 2022;76(4):227-236.
doi:10.2298/HEMIND220816018D .

Dikić, Stefan, Glišić, Dragomir, Fadel, Abdunaser Hamza, Jovanović, Gvozden, Radović, Nenad, "Physical simulation of finish rolling of microalloyed steels in isothermal conditions" in Hemijska industrija, 76, no. 4 (2022):227-236,
https://doi.org/10.2298/HEMIND220816018D . .

TY  - JOUR
AU  - Tanasković, Jovan
AU  - Franklin, F.
AU  - Radović, Nenad
AU  - Zivić, Fatima
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5365
AB  - The subject of this paper is the structural design of a safety steel device that is located between the standard wagon buffer and the collision energy absorber. The safety steel device is a sacrifical part able to withstand normal operating loads from the buffer across the absorber to the vehicle bearing structure without any permanent deformation, but experiences fully controlled fracture when the load exceeds the defined threshold. Following fracture, the load path is through the energy absorber. The sacrificial part is a ring made from quenched and tempered low alloyed steel with precisely defined heat treatment and material properties. Experimental investigations of scaled samples were performed to get mechanical characteristics of the material and geometry. A full-scale prototype of the safety device was produced, and final quasi-static and dynamic experiments were conducted. The results validate the anaytical predictions, and thus validate the design method used here for dimensioning the safety steel device.
PB  - Budapest Tech Polytechnical Institution
T2  - Acta Polytechnica Hungarica
T1  - Structural Design of Safety Steel Device of Railway Vehicles Through Analytical and Experimental Investigations
EP  - 33
IS  - 6
SP  - 21
VL  - 19
DO  - 10.12700/APH.19.6.2022.6.3
ER  - 

@article{
author = "Tanasković, Jovan and Franklin, F. and Radović, Nenad and Zivić, Fatima",
year = "2022",
abstract = "The subject of this paper is the structural design of a safety steel device that is located between the standard wagon buffer and the collision energy absorber. The safety steel device is a sacrifical part able to withstand normal operating loads from the buffer across the absorber to the vehicle bearing structure without any permanent deformation, but experiences fully controlled fracture when the load exceeds the defined threshold. Following fracture, the load path is through the energy absorber. The sacrificial part is a ring made from quenched and tempered low alloyed steel with precisely defined heat treatment and material properties. Experimental investigations of scaled samples were performed to get mechanical characteristics of the material and geometry. A full-scale prototype of the safety device was produced, and final quasi-static and dynamic experiments were conducted. The results validate the anaytical predictions, and thus validate the design method used here for dimensioning the safety steel device.",
publisher = "Budapest Tech Polytechnical Institution",
journal = "Acta Polytechnica Hungarica",
title = "Structural Design of Safety Steel Device of Railway Vehicles Through Analytical and Experimental Investigations",
pages = "33-21",
number = "6",
volume = "19",
doi = "10.12700/APH.19.6.2022.6.3"
}

Tanasković, J., Franklin, F., Radović, N.,& Zivić, F.. (2022). Structural Design of Safety Steel Device of Railway Vehicles Through Analytical and Experimental Investigations. in Acta Polytechnica Hungarica
Budapest Tech Polytechnical Institution., 19(6), 21-33.
https://doi.org/10.12700/APH.19.6.2022.6.3

Tanasković J, Franklin F, Radović N, Zivić F. Structural Design of Safety Steel Device of Railway Vehicles Through Analytical and Experimental Investigations. in Acta Polytechnica Hungarica. 2022;19(6):21-33.
doi:10.12700/APH.19.6.2022.6.3 .

Tanasković, Jovan, Franklin, F., Radović, Nenad, Zivić, Fatima, "Structural Design of Safety Steel Device of Railway Vehicles Through Analytical and Experimental Investigations" in Acta Polytechnica Hungarica, 19, no. 6 (2022):21-33,
https://doi.org/10.12700/APH.19.6.2022.6.3 . .

TY  - JOUR
AU  - Jovanović, Gvozden
AU  - Glišić, Dragomir
AU  - Dikić, Stefan
AU  - Radović, Nenad
AU  - Patarić, Aleksandra
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5310
AB  - Cleavage fracture of the V and Ti-V microalloyed forging steels was investigated by the four-point bending testing of the notched specimens of Griffith-Owen’s type at −196◦ C, in conjunction with the finite element analysis and the fractographic examination by scanning electron microscopy. To assess the mixed microstructure consisting mostly of the acicular ferrite, alongside proeutectoid ferrite grains and pearlite, the samples were held at 1250◦ C for 30 min and subsequently cooled instill air. Cleavage fracture was initiated in the matrix under the high plastic strains near the notch root of the four-point bending specimens without the participation of the second phase particles in the process. Estimated values of the effective surface energy for the V and the Ti-V microalloyed steel of 37 Jm−2 and 74 Jm−2, respectively, and the related increase of local critical fracture stress were attributed to the increased content of the acicular ferrite. It was concluded that the observed increase of the local stress for cleavage crack propagation through the matrix was due to the increased number of the high angle boundaries, but also that the acicular ferrite affects the cleavage fracture mechanism by its characteristic stress–strain response with relatively low yield strength and considerable ductility at −196◦ C.
PB  - MDPI
T2  - Materials
T1  - Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures
IS  - 5
SP  - 1760
VL  - 15
DO  - 10.3390/ma15051760
ER  - 

@article{
author = "Jovanović, Gvozden and Glišić, Dragomir and Dikić, Stefan and Radović, Nenad and Patarić, Aleksandra",
year = "2022",
abstract = "Cleavage fracture of the V and Ti-V microalloyed forging steels was investigated by the four-point bending testing of the notched specimens of Griffith-Owen’s type at −196◦ C, in conjunction with the finite element analysis and the fractographic examination by scanning electron microscopy. To assess the mixed microstructure consisting mostly of the acicular ferrite, alongside proeutectoid ferrite grains and pearlite, the samples were held at 1250◦ C for 30 min and subsequently cooled instill air. Cleavage fracture was initiated in the matrix under the high plastic strains near the notch root of the four-point bending specimens without the participation of the second phase particles in the process. Estimated values of the effective surface energy for the V and the Ti-V microalloyed steel of 37 Jm−2 and 74 Jm−2, respectively, and the related increase of local critical fracture stress were attributed to the increased content of the acicular ferrite. It was concluded that the observed increase of the local stress for cleavage crack propagation through the matrix was due to the increased number of the high angle boundaries, but also that the acicular ferrite affects the cleavage fracture mechanism by its characteristic stress–strain response with relatively low yield strength and considerable ductility at −196◦ C.",
publisher = "MDPI",
journal = "Materials",
title = "Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures",
number = "5",
pages = "1760",
volume = "15",
doi = "10.3390/ma15051760"
}

Jovanović, G., Glišić, D., Dikić, S., Radović, N.,& Patarić, A.. (2022). Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures. in Materials
MDPI., 15(5), 1760.
https://doi.org/10.3390/ma15051760

Jovanović G, Glišić D, Dikić S, Radović N, Patarić A. Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures. in Materials. 2022;15(5):1760.
doi:10.3390/ma15051760 .

Jovanović, Gvozden, Glišić, Dragomir, Dikić, Stefan, Radović, Nenad, Patarić, Aleksandra, "Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures" in Materials, 15, no. 5 (2022):1760,
https://doi.org/10.3390/ma15051760 . .

TY  - JOUR
AU  - Dikić, Stefan
AU  - Glišić, Dragomir
AU  - Fadel, Abdunnaser
AU  - Jovanovic, Gvozden
AU  - Radović, Nenad
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4873
AB  - Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 degrees C were isothermally treated in the range from 350 to 600 degrees C and subsequently water quenched. The final microstructure of the samples held at 350 degrees C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 degrees C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 degrees C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 degrees C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa.
T2  - Metals
T1  - Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel
IS  - 7
VL  - 11
DO  - 10.3390/met11071011
ER  - 

@article{
author = "Dikić, Stefan and Glišić, Dragomir and Fadel, Abdunnaser and Jovanovic, Gvozden and Radović, Nenad",
year = "2021",
abstract = "Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 degrees C were isothermally treated in the range from 350 to 600 degrees C and subsequently water quenched. The final microstructure of the samples held at 350 degrees C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 degrees C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 degrees C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 degrees C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa.",
journal = "Metals",
title = "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel",
number = "7",
volume = "11",
doi = "10.3390/met11071011"
}

Dikić, S., Glišić, D., Fadel, A., Jovanovic, G.,& Radović, N.. (2021). Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. in Metals, 11(7).
https://doi.org/10.3390/met11071011

Dikić S, Glišić D, Fadel A, Jovanovic G, Radović N. Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. in Metals. 2021;11(7).
doi:10.3390/met11071011 .

Dikić, Stefan, Glišić, Dragomir, Fadel, Abdunnaser, Jovanovic, Gvozden, Radović, Nenad, "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel" in Metals, 11, no. 7 (2021),
https://doi.org/10.3390/met11071011 . .

TY  - JOUR
AU  - Vuksic-Popovic, M.
AU  - Tanaskovic, J.
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Franklin, F. J.
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4797
AB  - Two modes of failure are analysed for coupling links, the mechanical connections that transmit traction forces between vehicles along the length of a train. Coupling links are designed to withstand the dynamic loads in normal operation but may break if applied loads exceed safe operating limits. Fractography of two failed links revealed that one had failed through brittle fracture, and one through ductile fracture. Metallography indicated that one sample was hardened and tempered with typical tempered martensite microstructure and the other was normalized with a ferrite-pearlite microstructure. A numerical model of a coupling link is developed and validated against experimental data. Results indicate that the failed links experienced loads above the permitted limit.
T2  - Engineering Failure Analysis
T1  - Experimental and numerical research on the failure of railway vehicles coupling links
VL  - 127
DO  - 10.1016/j.engfailanal.2021.105497
ER  - 

@article{
author = "Vuksic-Popovic, M. and Tanaskovic, J. and Glišić, Dragomir and Radović, Nenad and Franklin, F. J.",
year = "2021",
abstract = "Two modes of failure are analysed for coupling links, the mechanical connections that transmit traction forces between vehicles along the length of a train. Coupling links are designed to withstand the dynamic loads in normal operation but may break if applied loads exceed safe operating limits. Fractography of two failed links revealed that one had failed through brittle fracture, and one through ductile fracture. Metallography indicated that one sample was hardened and tempered with typical tempered martensite microstructure and the other was normalized with a ferrite-pearlite microstructure. A numerical model of a coupling link is developed and validated against experimental data. Results indicate that the failed links experienced loads above the permitted limit.",
journal = "Engineering Failure Analysis",
title = "Experimental and numerical research on the failure of railway vehicles coupling links",
volume = "127",
doi = "10.1016/j.engfailanal.2021.105497"
}

Vuksic-Popovic, M., Tanaskovic, J., Glišić, D., Radović, N.,& Franklin, F. J.. (2021). Experimental and numerical research on the failure of railway vehicles coupling links. in Engineering Failure Analysis, 127.
https://doi.org/10.1016/j.engfailanal.2021.105497

Vuksic-Popovic M, Tanaskovic J, Glišić D, Radović N, Franklin FJ. Experimental and numerical research on the failure of railway vehicles coupling links. in Engineering Failure Analysis. 2021;127.
doi:10.1016/j.engfailanal.2021.105497 .

Vuksic-Popovic, M., Tanaskovic, J., Glišić, Dragomir, Radović, Nenad, Franklin, F. J., "Experimental and numerical research on the failure of railway vehicles coupling links" in Engineering Failure Analysis, 127 (2021),
https://doi.org/10.1016/j.engfailanal.2021.105497 . .

TY  - JOUR
AU  - Simic, Marko
AU  - Radović, Nenad
AU  - Gordic, Milan
AU  - Ruzic, Jovana
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4762
AB  - Copper-based alloys and composites, owing to their convenient properties, are being considered essential materials in various industries. Since copper possesses an ability to develop high corrosion resistance, putting it in the domain of a desirable material in the manufacturing of valves, pipes, and also systems that carry industrial gases and aqueous fluids. Its usage is also invaluable for cables and electrical wires. This review paper describes diversity in copper alloy processing techniques (powder and ingot metallurgy) which are alongside the phase transformation kinetics interpreted and explained in detail. Furthermore, the focus is put on the copper alloys, as well as the kinetics present in these systems, with the application being highlighted. Correlation between physical properties and phase transformation kinetics in copper alloys is made. It is shown that if certain alloying elements are to be added, different properties could be improved. The effect of phase precipitation on phase transformation kinetics of copper alloys is shown by studying the Cu-15Ni-8Sn alloy.
T2  - Metallurgical & Materials Engineering
T1  - Effect of process parameters on the phase transformation kinetics in copper-based alloys and composites
EP  - 373
IS  - 4
SP  - 365
VL  - 26
DO  - 10.30544/571
ER  - 

@article{
author = "Simic, Marko and Radović, Nenad and Gordic, Milan and Ruzic, Jovana",
year = "2020",
abstract = "Copper-based alloys and composites, owing to their convenient properties, are being considered essential materials in various industries. Since copper possesses an ability to develop high corrosion resistance, putting it in the domain of a desirable material in the manufacturing of valves, pipes, and also systems that carry industrial gases and aqueous fluids. Its usage is also invaluable for cables and electrical wires. This review paper describes diversity in copper alloy processing techniques (powder and ingot metallurgy) which are alongside the phase transformation kinetics interpreted and explained in detail. Furthermore, the focus is put on the copper alloys, as well as the kinetics present in these systems, with the application being highlighted. Correlation between physical properties and phase transformation kinetics in copper alloys is made. It is shown that if certain alloying elements are to be added, different properties could be improved. The effect of phase precipitation on phase transformation kinetics of copper alloys is shown by studying the Cu-15Ni-8Sn alloy.",
journal = "Metallurgical & Materials Engineering",
title = "Effect of process parameters on the phase transformation kinetics in copper-based alloys and composites",
pages = "373-365",
number = "4",
volume = "26",
doi = "10.30544/571"
}

Simic, M., Radović, N., Gordic, M.,& Ruzic, J.. (2020). Effect of process parameters on the phase transformation kinetics in copper-based alloys and composites. in Metallurgical & Materials Engineering, 26(4), 365-373.
https://doi.org/10.30544/571

Simic M, Radović N, Gordic M, Ruzic J. Effect of process parameters on the phase transformation kinetics in copper-based alloys and composites. in Metallurgical & Materials Engineering. 2020;26(4):365-373.
doi:10.30544/571 .

Simic, Marko, Radović, Nenad, Gordic, Milan, Ruzic, Jovana, "Effect of process parameters on the phase transformation kinetics in copper-based alloys and composites" in Metallurgical & Materials Engineering, 26, no. 4 (2020):365-373,
https://doi.org/10.30544/571 . .

TY  - JOUR
AU  - Radović, Nenad
AU  - Vukicević, Goran
AU  - Glišić, Dragomir
AU  - Dikić, Stefan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4084
AB  - Some aspects of deformation, precipitation, and recrystallization behavior in medium carbon V-microalloyed and low carbon Nb/Ti-microalloyed steels are presented in the paper. Changes in microstructure are explained together with methods of quantification. The temperature of No-recrystallization (Tnr) is defined as a milestone to show the onset of retardation of recrystallization while the apparent activation energy for hot working shows the extent of this retardation. In the case of high cooling rates, this method is not sufficiently sensitive and Trl (recrystallization limit temperature) and Trs (recrystallization stop temperature) must be evaluated from softening data. Paper presented the possibility to estimate Tnr temperature on six stands finishing train at Hot Strip Mill in HBIS Iron and Steel Serbia, Smederevo as well as the activation energy for static recrystallization, QSRX, derived from Tnr temperatures.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metallurgical & Materials Engineering
T1  - Some aspects of physical metallurgy of microalloyed steels
EP  - 263
IS  - 4
SP  - 247
VL  - 25
DO  - 10.30544/468
ER  - 

@article{
author = "Radović, Nenad and Vukicević, Goran and Glišić, Dragomir and Dikić, Stefan",
year = "2019",
abstract = "Some aspects of deformation, precipitation, and recrystallization behavior in medium carbon V-microalloyed and low carbon Nb/Ti-microalloyed steels are presented in the paper. Changes in microstructure are explained together with methods of quantification. The temperature of No-recrystallization (Tnr) is defined as a milestone to show the onset of retardation of recrystallization while the apparent activation energy for hot working shows the extent of this retardation. In the case of high cooling rates, this method is not sufficiently sensitive and Trl (recrystallization limit temperature) and Trs (recrystallization stop temperature) must be evaluated from softening data. Paper presented the possibility to estimate Tnr temperature on six stands finishing train at Hot Strip Mill in HBIS Iron and Steel Serbia, Smederevo as well as the activation energy for static recrystallization, QSRX, derived from Tnr temperatures.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metallurgical & Materials Engineering",
title = "Some aspects of physical metallurgy of microalloyed steels",
pages = "263-247",
number = "4",
volume = "25",
doi = "10.30544/468"
}

Radović, N., Vukicević, G., Glišić, D.,& Dikić, S.. (2019). Some aspects of physical metallurgy of microalloyed steels. in Metallurgical & Materials Engineering
Savez inženjera metalurgije Srbije, Beograd., 25(4), 247-263.
https://doi.org/10.30544/468

Radović N, Vukicević G, Glišić D, Dikić S. Some aspects of physical metallurgy of microalloyed steels. in Metallurgical & Materials Engineering. 2019;25(4):247-263.
doi:10.30544/468 .

Radović, Nenad, Vukicević, Goran, Glišić, Dragomir, Dikić, Stefan, "Some aspects of physical metallurgy of microalloyed steels" in Metallurgical & Materials Engineering, 25, no. 4 (2019):247-263,
https://doi.org/10.30544/468 . .

TY  - JOUR
AU  - Pavlović, Miloš
AU  - Radović, Ljubica
AU  - Radisavljević, Igor
AU  - Radović, Nenad
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4281
AB  - The aim of this work was to evaluate the influence of welding speed on microstructure, mechanical properties, as well as Intergranular corrosion (IGC) susceptibility of EN AW-5083 alloy welded using FSW. FSW was performed using constant rotation speed of 750 Rev/min, while welding speed was varied from 73 mm/min, 150 mm/min to 190 mm/min. Results show that increase of welding speed lead to decrease of the size of the nugget. This behavior is attributed to decrease of heat input during welding. Accordingly, lower grain size provides increase of the strength. All tested welds are resistant to IGC, evaluating by mass loss according to NAMLT test, and resistivity slightly decrease with increasing welding speed.
T2  - Advanced Technologies and Materials
T1  - The effect of friction stirs welding speed on microstructure, mechanical properties and IGC of EN AW-5083 plates
EP  - 13
IS  - 1
SP  - 7
VL  - 44
DO  - 10.24867/ATM-2019-1-002
ER  - 

@article{
author = "Pavlović, Miloš and Radović, Ljubica and Radisavljević, Igor and Radović, Nenad",
year = "2019",
abstract = "The aim of this work was to evaluate the influence of welding speed on microstructure, mechanical properties, as well as Intergranular corrosion (IGC) susceptibility of EN AW-5083 alloy welded using FSW. FSW was performed using constant rotation speed of 750 Rev/min, while welding speed was varied from 73 mm/min, 150 mm/min to 190 mm/min. Results show that increase of welding speed lead to decrease of the size of the nugget. This behavior is attributed to decrease of heat input during welding. Accordingly, lower grain size provides increase of the strength. All tested welds are resistant to IGC, evaluating by mass loss according to NAMLT test, and resistivity slightly decrease with increasing welding speed.",
journal = "Advanced Technologies and Materials",
title = "The effect of friction stirs welding speed on microstructure, mechanical properties and IGC of EN AW-5083 plates",
pages = "13-7",
number = "1",
volume = "44",
doi = "10.24867/ATM-2019-1-002"
}

Pavlović, M., Radović, L., Radisavljević, I.,& Radović, N.. (2019). The effect of friction stirs welding speed on microstructure, mechanical properties and IGC of EN AW-5083 plates. in Advanced Technologies and Materials, 44(1), 7-13.
https://doi.org/10.24867/ATM-2019-1-002

Pavlović M, Radović L, Radisavljević I, Radović N. The effect of friction stirs welding speed on microstructure, mechanical properties and IGC of EN AW-5083 plates. in Advanced Technologies and Materials. 2019;44(1):7-13.
doi:10.24867/ATM-2019-1-002 .

Pavlović, Miloš, Radović, Ljubica, Radisavljević, Igor, Radović, Nenad, "The effect of friction stirs welding speed on microstructure, mechanical properties and IGC of EN AW-5083 plates" in Advanced Technologies and Materials, 44, no. 1 (2019):7-13,
https://doi.org/10.24867/ATM-2019-1-002 . .

TY  - JOUR
AU  - Gligorijević, Bojan
AU  - Vilotijević, Miroljub N.
AU  - Scepanović, Maja
AU  - Radovanović, Radovan V.
AU  - Radović, Nenad
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3562
AB  - The present study estimated the cracking phenomenon in as-plasma-sprayed hydroxylapatite coatings (HACs) after they were being subjected to the severe cutting conditions in the direction perpendicular to the coating/substrate interface. In order to evaluate the effects of substrate preheating on the occurrence of micro-cracks, the HACs were deposited at different initial substrate temperatures (T-S = 20, 100 and 200 degrees C). The changes in phase composition and HA splat morphology with T-S were observed and were correlated with the cracking occurrence. The results showed that severe cutting conditions introduced a localized cracking in the regions of HACs dominantly attributed to the brittle hydroxyl- deficient amorphous calcium phosphate (ACP) phase. This effect was particularly observable in the HACs deposited without preheating of substrate. On the other hand, the preheating of substrate reduced the presence of micro-cracks and caused insignificant changes in the average local phase composition. In HACs deposited with preheating of substrate, the HA splats (of which HACs are composed) were thinner and recrystallized HA regions seemed smaller in size and more evenly distributed. These results implied potentially important roles of the HA splat formation mechanism on the distribution of ACP and recrystallized HA regions in the as-plasma-sprayed HACs and the cracking resistance of HACs.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Cracking caused by cutting of plasma-sprayed hydroxyapatite coatings and its relation to the structural features of coatings deposited at different initial substrate temperatures
EP  - 249
IS  - 3
SP  - 241
VL  - 71
DO  - 10.2298/HEMIND160513034G
ER  - 

@article{
author = "Gligorijević, Bojan and Vilotijević, Miroljub N. and Scepanović, Maja and Radovanović, Radovan V. and Radović, Nenad",
year = "2017",
abstract = "The present study estimated the cracking phenomenon in as-plasma-sprayed hydroxylapatite coatings (HACs) after they were being subjected to the severe cutting conditions in the direction perpendicular to the coating/substrate interface. In order to evaluate the effects of substrate preheating on the occurrence of micro-cracks, the HACs were deposited at different initial substrate temperatures (T-S = 20, 100 and 200 degrees C). The changes in phase composition and HA splat morphology with T-S were observed and were correlated with the cracking occurrence. The results showed that severe cutting conditions introduced a localized cracking in the regions of HACs dominantly attributed to the brittle hydroxyl- deficient amorphous calcium phosphate (ACP) phase. This effect was particularly observable in the HACs deposited without preheating of substrate. On the other hand, the preheating of substrate reduced the presence of micro-cracks and caused insignificant changes in the average local phase composition. In HACs deposited with preheating of substrate, the HA splats (of which HACs are composed) were thinner and recrystallized HA regions seemed smaller in size and more evenly distributed. These results implied potentially important roles of the HA splat formation mechanism on the distribution of ACP and recrystallized HA regions in the as-plasma-sprayed HACs and the cracking resistance of HACs.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Cracking caused by cutting of plasma-sprayed hydroxyapatite coatings and its relation to the structural features of coatings deposited at different initial substrate temperatures",
pages = "249-241",
number = "3",
volume = "71",
doi = "10.2298/HEMIND160513034G"
}

Gligorijević, B., Vilotijević, M. N., Scepanović, M., Radovanović, R. V.,& Radović, N.. (2017). Cracking caused by cutting of plasma-sprayed hydroxyapatite coatings and its relation to the structural features of coatings deposited at different initial substrate temperatures. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 71(3), 241-249.
https://doi.org/10.2298/HEMIND160513034G

Gligorijević B, Vilotijević MN, Scepanović M, Radovanović RV, Radović N. Cracking caused by cutting of plasma-sprayed hydroxyapatite coatings and its relation to the structural features of coatings deposited at different initial substrate temperatures. in Hemijska industrija. 2017;71(3):241-249.
doi:10.2298/HEMIND160513034G .

Gligorijević, Bojan, Vilotijević, Miroljub N., Scepanović, Maja, Radovanović, Radovan V., Radović, Nenad, "Cracking caused by cutting of plasma-sprayed hydroxyapatite coatings and its relation to the structural features of coatings deposited at different initial substrate temperatures" in Hemijska industrija, 71, no. 3 (2017):241-249,
https://doi.org/10.2298/HEMIND160513034G . .

TY  - JOUR
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Fadel, Abdunnaser
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3682
AB  - Medium carbon V-microalloyed steel continuously cooled from the austenitization temperature at still air, with predominantly acicular ferrite structure, has been investigated by means of four-point bending of notched Griffiths-Owens's type specimens at liquid nitrogen temperature. Local fracture stress and plastic strain were determined by using finite element analysis and fracture surface examination using scanning electron microscope. It was revealed that cleavage fracture initiation, which takes place close to the notch root in the narrow zone of high plastic strains, is not related to any broken coarse second phase particles. It was assumed that microcracks nucleate by strain induced fracture of pearlite nodules. Two effective surface energy values of 24 and 42 J/m(2) were estimated according to the Griffith's equation, indicating the influence of crystallographic orientation between neighboring grains at the origin of fracture. Lower value was attributed to fracture of coarse ferrite-pearlite units with similar crystallographic orientation and higher value to fracture propagation through fine acicular ferrite matrix.
PB  - Springer-Verlag Berlin, Berlin
T2  - Fracture At All Scales
T1  - Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel
EP  - 219
SP  - 209
DO  - 10.1007/978-3-319-32634-4_11
ER  - 

@article{
author = "Glišić, Dragomir and Radović, Nenad and Drobnjak, Đorđe and Fadel, Abdunnaser",
year = "2017",
abstract = "Medium carbon V-microalloyed steel continuously cooled from the austenitization temperature at still air, with predominantly acicular ferrite structure, has been investigated by means of four-point bending of notched Griffiths-Owens's type specimens at liquid nitrogen temperature. Local fracture stress and plastic strain were determined by using finite element analysis and fracture surface examination using scanning electron microscope. It was revealed that cleavage fracture initiation, which takes place close to the notch root in the narrow zone of high plastic strains, is not related to any broken coarse second phase particles. It was assumed that microcracks nucleate by strain induced fracture of pearlite nodules. Two effective surface energy values of 24 and 42 J/m(2) were estimated according to the Griffith's equation, indicating the influence of crystallographic orientation between neighboring grains at the origin of fracture. Lower value was attributed to fracture of coarse ferrite-pearlite units with similar crystallographic orientation and higher value to fracture propagation through fine acicular ferrite matrix.",
publisher = "Springer-Verlag Berlin, Berlin",
journal = "Fracture At All Scales",
title = "Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel",
pages = "219-209",
doi = "10.1007/978-3-319-32634-4_11"
}

Glišić, D., Radović, N., Drobnjak, Đ.,& Fadel, A.. (2017). Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel. in Fracture At All Scales
Springer-Verlag Berlin, Berlin., 209-219.
https://doi.org/10.1007/978-3-319-32634-4_11

Glišić D, Radović N, Drobnjak Đ, Fadel A. Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel. in Fracture At All Scales. 2017;:209-219.
doi:10.1007/978-3-319-32634-4_11 .

Glišić, Dragomir, Radović, Nenad, Drobnjak, Đorđe, Fadel, Abdunnaser, "Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel" in Fracture At All Scales (2017):209-219,
https://doi.org/10.1007/978-3-319-32634-4_11 . .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3519
AB  - In this work, the structural and mechanical properties of friction stir welded dissimilar butt joints of AA2024-T351 to AA5083-H112 aluminum alloys were evaluated. Plates of 6 mm thick were friction stir welded with optimized tool. In the first case, plate of AA2024 was positioned on the advancing and plate of AA5083 was on the retreating side of the weld. In second case, position of the plate was opposite. Specimens were welded using rotation rate of 750 rpm and welding speed of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface. The effects of rotation and lateral speed of the welding tool were related to structural features and mechanical properties. The structural appearances of concentric rings in the nugget zone were controlled by tool speed and plate position. Structural analysis of the joint cross-section, revealed the distinct lamellar bands. The joints consistently failed on the AA5083 aluminum alloy plate. Failures were observed through the heat-affected zone at distance of approximately 21 mm from weld center.
AB  - U radu su predstavljeni rezultati strukturnih i mehaničkih ispitivanja sučeonih spojeva raznorodnih aluminijumskih legura AlCu4,5Mg (AA2024) i AlMg4,5Mn (AA5083) zavarenih postupkom FSW. Primenom optimizovang alata za zavarivanje, spojene su ploče debljine 6 mm. Međusobni položaj ploča u spoju je variran tako da je u prvom slučaju ploča od AA2024 pozicionirana na strani napredovanja a ploča od AA5083 na povratnoj strani spoja. U drugom slučaju položaj ploča je bio obrnut. Korišćeni su sledeći parametri zavarivanja: brzina rotacije alata nije menjana i iznosila je 750 obr/min a brzina zavarivanja iznosila je 73 i 93 mm/min. Dobijeni su spojevi bez prisustva grešaka i sa glatkom odnosno prihvatljivo ravnom površinom spoja. Analiziran je uticaj parametra zavarivanja na dobijenu strukturu i mehanička svojstva spoja. Oblik grumena i u njemu prisutnih koncentričnih krugova, zavisi od brzine zavarivanja i položaja ploča u spoju. Do loma uvek dolazi na strani spoja gde je pozicionirana ploča od legure AA5083. Karakteristično je da se lom uvek dešava na rastojanju od oko 21 mm od centra spoja.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys
T1  - Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom
EP  - 18
IS  - 1
SP  - 11
VL  - 62
DO  - 10.5937/zzk1701011R
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Radović, Nenad and Grabulov, Vencislav",
year = "2017",
abstract = "In this work, the structural and mechanical properties of friction stir welded dissimilar butt joints of AA2024-T351 to AA5083-H112 aluminum alloys were evaluated. Plates of 6 mm thick were friction stir welded with optimized tool. In the first case, plate of AA2024 was positioned on the advancing and plate of AA5083 was on the retreating side of the weld. In second case, position of the plate was opposite. Specimens were welded using rotation rate of 750 rpm and welding speed of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface. The effects of rotation and lateral speed of the welding tool were related to structural features and mechanical properties. The structural appearances of concentric rings in the nugget zone were controlled by tool speed and plate position. Structural analysis of the joint cross-section, revealed the distinct lamellar bands. The joints consistently failed on the AA5083 aluminum alloy plate. Failures were observed through the heat-affected zone at distance of approximately 21 mm from weld center., U radu su predstavljeni rezultati strukturnih i mehaničkih ispitivanja sučeonih spojeva raznorodnih aluminijumskih legura AlCu4,5Mg (AA2024) i AlMg4,5Mn (AA5083) zavarenih postupkom FSW. Primenom optimizovang alata za zavarivanje, spojene su ploče debljine 6 mm. Međusobni položaj ploča u spoju je variran tako da je u prvom slučaju ploča od AA2024 pozicionirana na strani napredovanja a ploča od AA5083 na povratnoj strani spoja. U drugom slučaju položaj ploča je bio obrnut. Korišćeni su sledeći parametri zavarivanja: brzina rotacije alata nije menjana i iznosila je 750 obr/min a brzina zavarivanja iznosila je 73 i 93 mm/min. Dobijeni su spojevi bez prisustva grešaka i sa glatkom odnosno prihvatljivo ravnom površinom spoja. Analiziran je uticaj parametra zavarivanja na dobijenu strukturu i mehanička svojstva spoja. Oblik grumena i u njemu prisutnih koncentričnih krugova, zavisi od brzine zavarivanja i položaja ploča u spoju. Do loma uvek dolazi na strani spoja gde je pozicionirana ploča od legure AA5083. Karakteristično je da se lom uvek dešava na rastojanju od oko 21 mm od centra spoja.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys, Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom",
pages = "18-11",
number = "1",
volume = "62",
doi = "10.5937/zzk1701011R"
}

Radisavljević, I., Živković, A., Radović, N.,& Grabulov, V.. (2017). Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 62(1), 11-18.
https://doi.org/10.5937/zzk1701011R

Radisavljević I, Živković A, Radović N, Grabulov V. Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys. in Zavarivanje i zavarene konstrukcije. 2017;62(1):11-18.
doi:10.5937/zzk1701011R .

Radisavljević, Igor, Živković, Aleksandar, Radović, Nenad, Grabulov, Vencislav, "Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys" in Zavarivanje i zavarene konstrukcije, 62, no. 1 (2017):11-18,
https://doi.org/10.5937/zzk1701011R . .

TY  - JOUR
AU  - Murariu, Alin
AU  - Veljić, Darko
AU  - Barjaktarević, Dragana
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Sedmak, Aleksandar
AU  - Đoković, Jelena M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3303
AB  - The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Influence of material velocity on heat generation during linear welding stage of friction stir welding
EP  - 1701
IS  - 5
SP  - 1693
VL  - 20
DO  - 10.2298/TSCI150904217M
ER  - 

@article{
author = "Murariu, Alin and Veljić, Darko and Barjaktarević, Dragana and Rakin, Marko and Radović, Nenad and Sedmak, Aleksandar and Đoković, Jelena M.",
year = "2016",
abstract = "The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Influence of material velocity on heat generation during linear welding stage of friction stir welding",
pages = "1701-1693",
number = "5",
volume = "20",
doi = "10.2298/TSCI150904217M"
}

Murariu, A., Veljić, D., Barjaktarević, D., Rakin, M., Radović, N., Sedmak, A.,& Đoković, J. M.. (2016). Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(5), 1693-1701.
https://doi.org/10.2298/TSCI150904217M

Murariu A, Veljić D, Barjaktarević D, Rakin M, Radović N, Sedmak A, Đoković JM. Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science. 2016;20(5):1693-1701.
doi:10.2298/TSCI150904217M .

Murariu, Alin, Veljić, Darko, Barjaktarević, Dragana, Rakin, Marko, Radović, Nenad, Sedmak, Aleksandar, Đoković, Jelena M., "Influence of material velocity on heat generation during linear welding stage of friction stir welding" in Thermal Science, 20, no. 5 (2016):1693-1701,
https://doi.org/10.2298/TSCI150904217M . .

TY  - JOUR
AU  - Gligorijević, Bojan
AU  - Vilotijević, Miroljub N.
AU  - Scepanović, Maja
AU  - Vidović, Dragoslav
AU  - Radović, Nenad
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3338
AB  - The aim of this work was to examine the dependence of the local surface structure (surface structural heterogeneity) on the local thickness (thickness uniformity) and structure properties along the thickness of hydroxyapatite coatings (HACs) deposited by using the high power (52 kW) laminar plasma jet. For the deposition process, a relatively small size of the feedstock hydroxyapatite powder (HAP) (33 mu m) was used. The HACs were deposited at different stand-off distances (SODs) (80, 100, and 150 mm) without preheating of substrates. The thickness measurements were performed by using the calibrated micrometer and light microscopy (LM). The surface micro-structure was analyzed by using the micro-Raman spectroscopy (MRS), whereas the micro-structure along the thickness of HACs was studied by using the MRS, X-ray powder diffractometry (XRPD), and LM (combined with chemical etching). The results showed a heterogeneous phase distribution on the surface of each HAC analyzed as well as the non-uniform thickness of HACs. Apparently, a correlation existed between the local surface structure and the local thickness of HACs. However, the MRS, XRPD, and LM analyses of micro-structure along the thickness of HACs indicated that the differences in the local surface structure could be related to the different recrystallization established during the plasma deposition process in the different parts along the thickness of each HAC analyzed.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - Surface structural heterogeneity of high power plasma-sprayed hydroxyapatite coatings
EP  - 430
SP  - 421
VL  - 687
DO  - 10.1016/j.jallcom.2016.06.163
ER  - 

@article{
author = "Gligorijević, Bojan and Vilotijević, Miroljub N. and Scepanović, Maja and Vidović, Dragoslav and Radović, Nenad",
year = "2016",
abstract = "The aim of this work was to examine the dependence of the local surface structure (surface structural heterogeneity) on the local thickness (thickness uniformity) and structure properties along the thickness of hydroxyapatite coatings (HACs) deposited by using the high power (52 kW) laminar plasma jet. For the deposition process, a relatively small size of the feedstock hydroxyapatite powder (HAP) (33 mu m) was used. The HACs were deposited at different stand-off distances (SODs) (80, 100, and 150 mm) without preheating of substrates. The thickness measurements were performed by using the calibrated micrometer and light microscopy (LM). The surface micro-structure was analyzed by using the micro-Raman spectroscopy (MRS), whereas the micro-structure along the thickness of HACs was studied by using the MRS, X-ray powder diffractometry (XRPD), and LM (combined with chemical etching). The results showed a heterogeneous phase distribution on the surface of each HAC analyzed as well as the non-uniform thickness of HACs. Apparently, a correlation existed between the local surface structure and the local thickness of HACs. However, the MRS, XRPD, and LM analyses of micro-structure along the thickness of HACs indicated that the differences in the local surface structure could be related to the different recrystallization established during the plasma deposition process in the different parts along the thickness of each HAC analyzed.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "Surface structural heterogeneity of high power plasma-sprayed hydroxyapatite coatings",
pages = "430-421",
volume = "687",
doi = "10.1016/j.jallcom.2016.06.163"
}

Gligorijević, B., Vilotijević, M. N., Scepanović, M., Vidović, D.,& Radović, N.. (2016). Surface structural heterogeneity of high power plasma-sprayed hydroxyapatite coatings. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 687, 421-430.
https://doi.org/10.1016/j.jallcom.2016.06.163

Gligorijević B, Vilotijević MN, Scepanović M, Vidović D, Radović N. Surface structural heterogeneity of high power plasma-sprayed hydroxyapatite coatings. in Journal of Alloys and Compounds. 2016;687:421-430.
doi:10.1016/j.jallcom.2016.06.163 .

Gligorijević, Bojan, Vilotijević, Miroljub N., Scepanović, Maja, Vidović, Dragoslav, Radović, Nenad, "Surface structural heterogeneity of high power plasma-sprayed hydroxyapatite coatings" in Journal of Alloys and Compounds, 687 (2016):421-430,
https://doi.org/10.1016/j.jallcom.2016.06.163 . .

TY  - JOUR
AU  - Gligorijević, Bojan
AU  - Vilotijević, Miroljub N.
AU  - Scepanović, Maja
AU  - Vuković, Nikola S.
AU  - Radović, Nenad
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3403
AB  - The aim of the present study was to investigate the influence of substrate preheating on the structural properties of hydroxyapatite coatings (HACs) deposited by using the high power (52 kW) laminar plasma jet. The deposition experiments were performed within the 20-200 degrees C temperature range at different stand-off distances. The structural properties in the thickness direction and at the surface of the HACs were investigated by using the micro-Raman spectroscopy, scanning electron microscopy coupled with energy dispersive spectrometry, and X-ray powder diffractometry. The deposition without the preheating of the substrate produced HACs with crystallinity gradient in the thickness direction. At the stand-off distance of 80 mm, the preheating of the substrate at 200 degrees C practically eliminated the crystallinity gradient. At distances from the coating/substrate interface shorter than similar to 100 mu m, the increase of crystallinity with the preheating of the substrate was dominantly attributed to the recrystallization of hydroxyl-rich ACP into HA. At longer distances and higher initial substrate temperatures (  gt  100 degrees C), the crystallinity changes were negligible, whereas the recrystallization of hydroxyl-deficient ACP into oxyapatite (OA) was also possible. The X-ray diffractometry indicated the deposition conditions under which a minimum residual stress was achieved. The results of the present study strongly suggested the relation between the ACP - gt  HA remystallization process and the bonding strength of the HACs.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Substrate preheating and structural properties of power plasma sprayed hydroxyapatite coatings
EP  - 420
IS  - 1
SP  - 411
VL  - 42
DO  - 10.1016/j.ceramint.2015.08.125
ER  - 

@article{
author = "Gligorijević, Bojan and Vilotijević, Miroljub N. and Scepanović, Maja and Vuković, Nikola S. and Radović, Nenad",
year = "2016",
abstract = "The aim of the present study was to investigate the influence of substrate preheating on the structural properties of hydroxyapatite coatings (HACs) deposited by using the high power (52 kW) laminar plasma jet. The deposition experiments were performed within the 20-200 degrees C temperature range at different stand-off distances. The structural properties in the thickness direction and at the surface of the HACs were investigated by using the micro-Raman spectroscopy, scanning electron microscopy coupled with energy dispersive spectrometry, and X-ray powder diffractometry. The deposition without the preheating of the substrate produced HACs with crystallinity gradient in the thickness direction. At the stand-off distance of 80 mm, the preheating of the substrate at 200 degrees C practically eliminated the crystallinity gradient. At distances from the coating/substrate interface shorter than similar to 100 mu m, the increase of crystallinity with the preheating of the substrate was dominantly attributed to the recrystallization of hydroxyl-rich ACP into HA. At longer distances and higher initial substrate temperatures (  gt  100 degrees C), the crystallinity changes were negligible, whereas the recrystallization of hydroxyl-deficient ACP into oxyapatite (OA) was also possible. The X-ray diffractometry indicated the deposition conditions under which a minimum residual stress was achieved. The results of the present study strongly suggested the relation between the ACP - gt  HA remystallization process and the bonding strength of the HACs.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Substrate preheating and structural properties of power plasma sprayed hydroxyapatite coatings",
pages = "420-411",
number = "1",
volume = "42",
doi = "10.1016/j.ceramint.2015.08.125"
}

Gligorijević, B., Vilotijević, M. N., Scepanović, M., Vuković, N. S.,& Radović, N.. (2016). Substrate preheating and structural properties of power plasma sprayed hydroxyapatite coatings. in Ceramics International
Elsevier Sci Ltd, Oxford., 42(1), 411-420.
https://doi.org/10.1016/j.ceramint.2015.08.125

Gligorijević B, Vilotijević MN, Scepanović M, Vuković NS, Radović N. Substrate preheating and structural properties of power plasma sprayed hydroxyapatite coatings. in Ceramics International. 2016;42(1):411-420.
doi:10.1016/j.ceramint.2015.08.125 .

Gligorijević, Bojan, Vilotijević, Miroljub N., Scepanović, Maja, Vuković, Nikola S., Radović, Nenad, "Substrate preheating and structural properties of power plasma sprayed hydroxyapatite coatings" in Ceramics International, 42, no. 1 (2016):411-420,
https://doi.org/10.1016/j.ceramint.2015.08.125 . .

TY  - JOUR
AU  - Hutli, Ezddin
AU  - Nedeljković, Miloš S.
AU  - Radović, Nenad
AU  - Bonyar, Attila
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3418
AB  - In order to accurately and reliably evaluate the cavitation erosion resistance of materials using a cavitating jet generator, the effects of the hydrodynamic parameters and the nozzle geometry on the erosion process were investigated. Since the behaviour of a high speed submerged cavitating jet is also depending on the working conditions; their influence is also discussed based on the evaluation of cavitation erosion process. The erosion rate was used as an indicator for cavitating jet behaviour. Specimens of commercial purity copper were subjected to high speed submerged cavitating jets under different initial conditions, for certain time periods. The force generated by jet cavitation is employed to initiate the erosion in surface. The tested specimens were investigated with a digital optical microscope and a profilometer. It was found that erosion becomes more pronounced with decreasing cavitation numbers, as well as with increasing exit jet velocities. The nozzle configuration and hydrodynamic parameters have strong influences on the erosion rate, eroded area and depth of erosion. A comparison between the obtained results explains some of the mechanisms involved in cavitation and erosion processes and their relation to the tested parameters. Mathematical expressions which combine these parameters with the erosion rate are obtained. These parameters are very important in order to control the cavitation as a phenomenon and also to control the performance of the cavitating jet generator.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Multiphase Flow
T1  - The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process
EP  - 38
SP  - 27
VL  - 83
DO  - 10.1016/j.ijmultiphaseflow.2016.03.005
ER  - 

@article{
author = "Hutli, Ezddin and Nedeljković, Miloš S. and Radović, Nenad and Bonyar, Attila",
year = "2016",
abstract = "In order to accurately and reliably evaluate the cavitation erosion resistance of materials using a cavitating jet generator, the effects of the hydrodynamic parameters and the nozzle geometry on the erosion process were investigated. Since the behaviour of a high speed submerged cavitating jet is also depending on the working conditions; their influence is also discussed based on the evaluation of cavitation erosion process. The erosion rate was used as an indicator for cavitating jet behaviour. Specimens of commercial purity copper were subjected to high speed submerged cavitating jets under different initial conditions, for certain time periods. The force generated by jet cavitation is employed to initiate the erosion in surface. The tested specimens were investigated with a digital optical microscope and a profilometer. It was found that erosion becomes more pronounced with decreasing cavitation numbers, as well as with increasing exit jet velocities. The nozzle configuration and hydrodynamic parameters have strong influences on the erosion rate, eroded area and depth of erosion. A comparison between the obtained results explains some of the mechanisms involved in cavitation and erosion processes and their relation to the tested parameters. Mathematical expressions which combine these parameters with the erosion rate are obtained. These parameters are very important in order to control the cavitation as a phenomenon and also to control the performance of the cavitating jet generator.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Multiphase Flow",
title = "The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process",
pages = "38-27",
volume = "83",
doi = "10.1016/j.ijmultiphaseflow.2016.03.005"
}

Hutli, E., Nedeljković, M. S., Radović, N.,& Bonyar, A.. (2016). The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process. in International Journal of Multiphase Flow
Pergamon-Elsevier Science Ltd, Oxford., 83, 27-38.
https://doi.org/10.1016/j.ijmultiphaseflow.2016.03.005

Hutli E, Nedeljković MS, Radović N, Bonyar A. The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process. in International Journal of Multiphase Flow. 2016;83:27-38.
doi:10.1016/j.ijmultiphaseflow.2016.03.005 .

Hutli, Ezddin, Nedeljković, Miloš S., Radović, Nenad, Bonyar, Attila, "The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process" in International Journal of Multiphase Flow, 83 (2016):27-38,
https://doi.org/10.1016/j.ijmultiphaseflow.2016.03.005 . .

TY  - JOUR
AU  - Hutli, Ezddin
AU  - Nedeljković, Miloš S.
AU  - Bonyar, Attila
AU  - Radović, Nenad
AU  - Llić, Vojislav
AU  - Debeljković, Aleksandra
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3431
AB  - The aim of this paper is to investigate the possible application of the cavitation phenomenon as efficient method to modify the surface properties (e.g. the surface roughness) in the nano- and micro-levels. Aluminum alloy (AlSiMg) specimens were subjected to high speed submerged cavitating jets under various working conditions, for short time periods between 15 and 30 s. The force generated by the cavitating jet is employed to modify the surface roughness of the specimen. The target surface was analyzed with optical microscopy, white light interferometry, atomic force microscopy (AFM) and also with electrostatic force microscopy (EFM). The results show the possibility to use the cavitation bubbles as a nanofabrication method e.g. for shotless surface peening. With AFM, the deformation mechanism and the formation of planar or wavy slip were also investigated. EFM shows that the changes in the surface roughness also have a strong influence on, the electrostatic field above a biased sample.
PB  - Elsevier Sci Ltd, Oxford
T2  - Tribology International
T1  - The ability of using the cavitation phenomenon as a tool to modify the surface characteristics in micro- and in nano-level
EP  - 97
SP  - 88
VL  - 101
DO  - 10.1016/j.triboint.2016.04.006
ER  - 

@article{
author = "Hutli, Ezddin and Nedeljković, Miloš S. and Bonyar, Attila and Radović, Nenad and Llić, Vojislav and Debeljković, Aleksandra",
year = "2016",
abstract = "The aim of this paper is to investigate the possible application of the cavitation phenomenon as efficient method to modify the surface properties (e.g. the surface roughness) in the nano- and micro-levels. Aluminum alloy (AlSiMg) specimens were subjected to high speed submerged cavitating jets under various working conditions, for short time periods between 15 and 30 s. The force generated by the cavitating jet is employed to modify the surface roughness of the specimen. The target surface was analyzed with optical microscopy, white light interferometry, atomic force microscopy (AFM) and also with electrostatic force microscopy (EFM). The results show the possibility to use the cavitation bubbles as a nanofabrication method e.g. for shotless surface peening. With AFM, the deformation mechanism and the formation of planar or wavy slip were also investigated. EFM shows that the changes in the surface roughness also have a strong influence on, the electrostatic field above a biased sample.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Tribology International",
title = "The ability of using the cavitation phenomenon as a tool to modify the surface characteristics in micro- and in nano-level",
pages = "97-88",
volume = "101",
doi = "10.1016/j.triboint.2016.04.006"
}

Hutli, E., Nedeljković, M. S., Bonyar, A., Radović, N., Llić, V.,& Debeljković, A.. (2016). The ability of using the cavitation phenomenon as a tool to modify the surface characteristics in micro- and in nano-level. in Tribology International
Elsevier Sci Ltd, Oxford., 101, 88-97.
https://doi.org/10.1016/j.triboint.2016.04.006

Hutli E, Nedeljković MS, Bonyar A, Radović N, Llić V, Debeljković A. The ability of using the cavitation phenomenon as a tool to modify the surface characteristics in micro- and in nano-level. in Tribology International. 2016;101:88-97.
doi:10.1016/j.triboint.2016.04.006 .

Hutli, Ezddin, Nedeljković, Miloš S., Bonyar, Attila, Radović, Nenad, Llić, Vojislav, Debeljković, Aleksandra, "The ability of using the cavitation phenomenon as a tool to modify the surface characteristics in micro- and in nano-level" in Tribology International, 101 (2016):88-97,
https://doi.org/10.1016/j.triboint.2016.04.006 . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Popović, Negica
AU  - Daşcău, Horia
AU  - Bajić, Nikola
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2893
AB  - U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu.
AB  - In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.
PB  - Society for Structural Integrity and Life (DIVK)
T2  - Structural Integrity and Life
T1  - Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu
T1  - Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety
EP  - 116
IS  - 2
SP  - 111
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2893
ER  - 

@article{
author = "Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko and Radović, Nenad and Popović, Negica and Daşcău, Horia and Bajić, Nikola",
year = "2015",
abstract = "U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu., In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.",
publisher = "Society for Structural Integrity and Life (DIVK)",
journal = "Structural Integrity and Life",
title = "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu, Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety",
pages = "116-111",
number = "2",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2893"
}

Veljić, D., Sedmak, A., Rakin, M., Radović, N., Popović, N., Daşcău, H.,& Bajić, N.. (2015). Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life
Society for Structural Integrity and Life (DIVK)., 15(2), 111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893

Veljić D, Sedmak A, Rakin M, Radović N, Popović N, Daşcău H, Bajić N. Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life. 2015;15(2):111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893 .

Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, Radović, Nenad, Popović, Negica, Daşcău, Horia, Bajić, Nikola, "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu" in Structural Integrity and Life, 15, no. 2 (2015):111-116,
https://hdl.handle.net/21.15107/rcub_technorep_2893 .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Grabulov, Vencislav
AU  - Radović, Nenad
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2894
AB  - The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface, in all four cases. Modification in pin design showed strong influence on macro structure and hardness distribution. Weak places are identified as low hardness zone, close to the nugget zone and are in good agreement with fracture location in tensile testing. Weld efficiency, as a measure of weld quality, is better in case of 310 tool, while UTS values can differ up to 13% for the equal welding parameters. Therefore, it can be assumed that small modification in tool design, particularly in pin geometry, can have great influence on weld formation and mechanical properties.
AB  - U radu je ispitivano kakav zajednički, kombinovani uticaj brzina rotacije alata, brzina zavarivanja i mala promena u geometriji trna alata imaju na zavarljivost, mehaničke i strukturne karakteristike sučeonog spoja Al legure 2024-T351 zavarene primenom FSW (zavarivanje trenjem alatom) postupka zavarivanja. Zavarivane su ploče dimenzija 260 mm×65 mm×6 mm. Ploče su pre zavarivanja mašinski obrađene i kruto stegnute za potpornu ploču. Zavarivanje je izvedeno u pravcu valjanja ploča, na alatnoj glodalici prilagođenoj postupku FSW. Dužina svakog zavarenog spoja iznosila je oko 210 mm. Korišćena su dva alata sa veoma slično profilisanim trnovima. Razlika u dizajnu trna alata je u obliku zavojnice, normalna (klasična) kod alata oznake 310 odnosno zaobljena za alat 310-O. Zavarivanje je izvedeno pri brzini rotacije alata od 750 o/min i brzinama zavarivanja 73 i 93 mm/min. Ukupno su zavarene četiri kombinacije spojeva. U svim slučajevima dobijen je zavareni spoj bez prisustva grešaka, sa glatkom odnosno delimično hrapavom površinom zavara. Prisutne su tri različite oblasti u spoju - grumen, zona termomehaničkog uticaja i zona uticaja toplote. Promene u dizajnu trna alata imaju znatnog uticaja na makrostrukturu spoja i raspodelu tvrdoće kroz spoj. Mapiranjem spoja, na osnovu raspodele tvrdoće, određene su oblasti sa najnižim vrednostima tvrdoće a nalaze se u neposrednoj blizini grumena, tačnije na liniji dodira grumena i zone termomehaničkog uticaja. Položaj oblasti najmanje tvrdoće je u saglasnosti sa mestom preloma zateznih epruveta. Efikasnost spoja, kao ocena kvaliteta spoja, je veća kod spojeva zavarenih alatom 310. U zavisnosti od alata, pri istim parametrima zavarivanja dobijene su različite vrednosti zateznih čvrstoća a razlika iznosi do 13%. Pokazano je da mala modifikacija u dizajnu trna alata ima velikog uticaja na formiranje spoja i njegove mehaničke karakteristike.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy
T1  - Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW
EP  - 330
IS  - 3
SP  - 323
VL  - 69
DO  - 10.2298/HEMIND131206020R
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Grabulov, Vencislav and Radović, Nenad",
year = "2015",
abstract = "The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface, in all four cases. Modification in pin design showed strong influence on macro structure and hardness distribution. Weak places are identified as low hardness zone, close to the nugget zone and are in good agreement with fracture location in tensile testing. Weld efficiency, as a measure of weld quality, is better in case of 310 tool, while UTS values can differ up to 13% for the equal welding parameters. Therefore, it can be assumed that small modification in tool design, particularly in pin geometry, can have great influence on weld formation and mechanical properties., U radu je ispitivano kakav zajednički, kombinovani uticaj brzina rotacije alata, brzina zavarivanja i mala promena u geometriji trna alata imaju na zavarljivost, mehaničke i strukturne karakteristike sučeonog spoja Al legure 2024-T351 zavarene primenom FSW (zavarivanje trenjem alatom) postupka zavarivanja. Zavarivane su ploče dimenzija 260 mm×65 mm×6 mm. Ploče su pre zavarivanja mašinski obrađene i kruto stegnute za potpornu ploču. Zavarivanje je izvedeno u pravcu valjanja ploča, na alatnoj glodalici prilagođenoj postupku FSW. Dužina svakog zavarenog spoja iznosila je oko 210 mm. Korišćena su dva alata sa veoma slično profilisanim trnovima. Razlika u dizajnu trna alata je u obliku zavojnice, normalna (klasična) kod alata oznake 310 odnosno zaobljena za alat 310-O. Zavarivanje je izvedeno pri brzini rotacije alata od 750 o/min i brzinama zavarivanja 73 i 93 mm/min. Ukupno su zavarene četiri kombinacije spojeva. U svim slučajevima dobijen je zavareni spoj bez prisustva grešaka, sa glatkom odnosno delimično hrapavom površinom zavara. Prisutne su tri različite oblasti u spoju - grumen, zona termomehaničkog uticaja i zona uticaja toplote. Promene u dizajnu trna alata imaju znatnog uticaja na makrostrukturu spoja i raspodelu tvrdoće kroz spoj. Mapiranjem spoja, na osnovu raspodele tvrdoće, određene su oblasti sa najnižim vrednostima tvrdoće a nalaze se u neposrednoj blizini grumena, tačnije na liniji dodira grumena i zone termomehaničkog uticaja. Položaj oblasti najmanje tvrdoće je u saglasnosti sa mestom preloma zateznih epruveta. Efikasnost spoja, kao ocena kvaliteta spoja, je veća kod spojeva zavarenih alatom 310. U zavisnosti od alata, pri istim parametrima zavarivanja dobijene su različite vrednosti zateznih čvrstoća a razlika iznosi do 13%. Pokazano je da mala modifikacija u dizajnu trna alata ima velikog uticaja na formiranje spoja i njegove mehaničke karakteristike.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy, Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW",
pages = "330-323",
number = "3",
volume = "69",
doi = "10.2298/HEMIND131206020R"
}

Radisavljević, I., Živković, A., Grabulov, V.,& Radović, N.. (2015). Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy. in Hemijska industrija
Association of Chemical Engineers of Serbia., 69(3), 323-330.
https://doi.org/10.2298/HEMIND131206020R

Radisavljević I, Živković A, Grabulov V, Radović N. Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy. in Hemijska industrija. 2015;69(3):323-330.
doi:10.2298/HEMIND131206020R .

Radisavljević, Igor, Živković, Aleksandar, Grabulov, Vencislav, Radović, Nenad, "Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy" in Hemijska industrija, 69, no. 3 (2015):323-330,
https://doi.org/10.2298/HEMIND131206020R . .

TY  - JOUR
AU  - Eramah, Abdsalam M.
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Tadić, Srđan
AU  - Radović, Nenad
AU  - Zrilić, Milorad
AU  - Perović, Milenko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2676
AB  - The aim of this work is to analyse the process of friction stir welding (FSW) of 3 mm thick aluminium plates made of high strength aluminium alloy - 2024 T3, as well as to assess the mechanical properties of the produced joints. Friction Stir Welding is a modern procedure which enables joining of similar and dissimilar materials in the solid state, by the combined action of heat and mechanical work. This paper presents an analysis of the experimental results obtained by testing the butt welded joints. Tensile strength of the produced joints is assessed, as well as the distribution of hardness, micro-and macrostructure through the joints (in the base material, nugget, heat affected zone and thermo-mechanically affected zone). Different combinations of the tool rotation speed and the welding speed are used, and the dependence of the properties of the joints on these parameters of welding technology is determined.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints
EP  - S28
SP  - S21
VL  - 18
DO  - 10.2298/TSCI130307170E
ER  - 

@article{
author = "Eramah, Abdsalam M. and Rakin, Marko and Veljić, Darko and Tadić, Srđan and Radović, Nenad and Zrilić, Milorad and Perović, Milenko",
year = "2014",
abstract = "The aim of this work is to analyse the process of friction stir welding (FSW) of 3 mm thick aluminium plates made of high strength aluminium alloy - 2024 T3, as well as to assess the mechanical properties of the produced joints. Friction Stir Welding is a modern procedure which enables joining of similar and dissimilar materials in the solid state, by the combined action of heat and mechanical work. This paper presents an analysis of the experimental results obtained by testing the butt welded joints. Tensile strength of the produced joints is assessed, as well as the distribution of hardness, micro-and macrostructure through the joints (in the base material, nugget, heat affected zone and thermo-mechanically affected zone). Different combinations of the tool rotation speed and the welding speed are used, and the dependence of the properties of the joints on these parameters of welding technology is determined.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints",
pages = "S28-S21",
volume = "18",
doi = "10.2298/TSCI130307170E"
}

Eramah, A. M., Rakin, M., Veljić, D., Tadić, S., Radović, N., Zrilić, M.,& Perović, M.. (2014). Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S21-S28.
https://doi.org/10.2298/TSCI130307170E

Eramah AM, Rakin M, Veljić D, Tadić S, Radović N, Zrilić M, Perović M. Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints. in Thermal Science. 2014;18:S21-S28.
doi:10.2298/TSCI130307170E .

Eramah, Abdsalam M., Rakin, Marko, Veljić, Darko, Tadić, Srđan, Radović, Nenad, Zrilić, Milorad, Perović, Milenko, "Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints" in Thermal Science, 18 (2014):S21-S28,
https://doi.org/10.2298/TSCI130307170E . .

TY  - JOUR
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Fadel, Abdunnaser
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2799
AB  - Cleavage fracture of the medium carbon V-microalloyed steel with structure consisting of acicular ferrite, pearlite and grain boundary ferrite has been investigated by means of four-point bending of the notched samples at -196 degrees C. It was found that cleavage fracture initiation has not been related to the coarse second phase particles cracking. Calculated values of the effective surface energy of 49 J/m(2) and critical cleavage fracture stress normalized by yield stress of 1.84 are in agreement with the results for the steels with ferrite-pearlite and bainite structures.
PB  - Elsevier Science Bv, Amsterdam
T2  - 20th European Conference on Fracture
T1  - Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel
EP  - 1231
SP  - 1226
VL  - 3
DO  - 10.1016/j.mspro.2014.06.199
ER  - 

@article{
author = "Glišić, Dragomir and Radović, Nenad and Drobnjak, Đorđe and Fadel, Abdunnaser",
year = "2014",
abstract = "Cleavage fracture of the medium carbon V-microalloyed steel with structure consisting of acicular ferrite, pearlite and grain boundary ferrite has been investigated by means of four-point bending of the notched samples at -196 degrees C. It was found that cleavage fracture initiation has not been related to the coarse second phase particles cracking. Calculated values of the effective surface energy of 49 J/m(2) and critical cleavage fracture stress normalized by yield stress of 1.84 are in agreement with the results for the steels with ferrite-pearlite and bainite structures.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "20th European Conference on Fracture",
title = "Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel",
pages = "1231-1226",
volume = "3",
doi = "10.1016/j.mspro.2014.06.199"
}

Glišić, D., Radović, N., Drobnjak, Đ.,& Fadel, A.. (2014). Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel. in 20th European Conference on Fracture
Elsevier Science Bv, Amsterdam., 3, 1226-1231.
https://doi.org/10.1016/j.mspro.2014.06.199

Glišić D, Radović N, Drobnjak Đ, Fadel A. Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel. in 20th European Conference on Fracture. 2014;3:1226-1231.
doi:10.1016/j.mspro.2014.06.199 .

Glišić, Dragomir, Radović, Nenad, Drobnjak, Đorđe, Fadel, Abdunnaser, "Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel" in 20th European Conference on Fracture, 3 (2014):1226-1231,
https://doi.org/10.1016/j.mspro.2014.06.199 . .

TY  - JOUR
AU  - Radović, Nenad
AU  - Glišić, Dragomir
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2605
AB  - A significant increase in the research activity dedicated to high manganese TWIP steels has occurred during the past few years, motivated by the breakthrough combination of strength and ductility possessed by these alloys. Here a short review of the relations between microstructure and mechanical properties is presented. This summarized knowledge explains why TWIP steel metallurgy is currently a topic of great practical interest of especially automotive industry.
AB  - Dvojnikovanjem Izazvana Plastičnost (TWinning Induced Plasticity - TWIP) u čelicima je fenomen koji je omogućio razvoj zasebne grupe čelika za koju se pretpostavlja da će imati masovnu upotrebu, naročito u autoindustriji. Mikrostruktura ovih čelika na sobnoj temperaturi se sastoji od austenita koji je stabilisan značajnim dodatkom mangana. U toku deformacije dolazi do dvojnikovanja koje značajno povećava otpor deformaciji, uz zadržavanje odlične plastičnosti, tako da su čvrstoće od 1300-2000 MPa praćene izduženjem od minimalno 45%. Sa vremena istraživanja su više usmerena na ispunjenje tehnoloških zahteva, kao što su zavarljivost, koroziona postojanost, mašinska obradljivost i sl.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Savremeni čelici - dvojnikovanjem izazvana plastičnost
EP  - 42
IS  - 1
SP  - 35
VL  - 59
DO  - 10.5937/zzk1401035R
ER  - 

@article{
author = "Radović, Nenad and Glišić, Dragomir",
year = "2014",
abstract = "A significant increase in the research activity dedicated to high manganese TWIP steels has occurred during the past few years, motivated by the breakthrough combination of strength and ductility possessed by these alloys. Here a short review of the relations between microstructure and mechanical properties is presented. This summarized knowledge explains why TWIP steel metallurgy is currently a topic of great practical interest of especially automotive industry., Dvojnikovanjem Izazvana Plastičnost (TWinning Induced Plasticity - TWIP) u čelicima je fenomen koji je omogućio razvoj zasebne grupe čelika za koju se pretpostavlja da će imati masovnu upotrebu, naročito u autoindustriji. Mikrostruktura ovih čelika na sobnoj temperaturi se sastoji od austenita koji je stabilisan značajnim dodatkom mangana. U toku deformacije dolazi do dvojnikovanja koje značajno povećava otpor deformaciji, uz zadržavanje odlične plastičnosti, tako da su čvrstoće od 1300-2000 MPa praćene izduženjem od minimalno 45%. Sa vremena istraživanja su više usmerena na ispunjenje tehnoloških zahteva, kao što su zavarljivost, koroziona postojanost, mašinska obradljivost i sl.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Savremeni čelici - dvojnikovanjem izazvana plastičnost",
pages = "42-35",
number = "1",
volume = "59",
doi = "10.5937/zzk1401035R"
}

Radović, N.,& Glišić, D.. (2014). Savremeni čelici - dvojnikovanjem izazvana plastičnost. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 59(1), 35-42.
https://doi.org/10.5937/zzk1401035R

Radović N, Glišić D. Savremeni čelici - dvojnikovanjem izazvana plastičnost. in Zavarivanje i zavarene konstrukcije. 2014;59(1):35-42.
doi:10.5937/zzk1401035R .

Radović, Nenad, Glišić, Dragomir, "Savremeni čelici - dvojnikovanjem izazvana plastičnost" in Zavarivanje i zavarene konstrukcije, 59, no. 1 (2014):35-42,
https://doi.org/10.5937/zzk1401035R . .